Understanding IPsec in SD-WAN

This chapter provides a comprehensive overview of IPsec, outlining its critical role in Software-Defined Wide Area Network (SD-WAN) solutions. It examines the two modes of IPsec—transport and tunnel mode—while focusing on practical applications like secure organizational communications and client VPNs. The discussion includes the intricacies of the Internet Key Exchange (IKE) protocol, common troubleshooting strategies, and contrasts IPsec with alternatives such as SSL VPNs and WireGuard.